ArcelorMittal, Algeria's Sider to Boost Steel Output

Production to More Than Double to Meet Car-Industry Demand

LONDON—ArcelorMittal and the Algerian-state-owned company Sider plan to more than double production capacity over the next five years at their jointly owned Algerian steel plant, in part to meet rising demand from North Africa's fast-growing car-making industry.

Despite a depressed passenger-car market across much of Europe, demand has been humming in stretches of North Africa, where manufacturers have been adding capacity—and...